DynamoDB table name is always converted to lowercase

[christophgysin]

When specifying a DynamoDB table name, it is converted to lowercase. This makes it impossible to refer to a table with a captial letter in the name.

UmzugCli({
  storage: 'umzug-dynamodb-storage',
  storageOptions: {
    dynamodb: new AWS.DynamoDB('2012-08-10'),
    table: 'Migrations',
  },

This will create a new table migrations instead of using an existing table Migrations.

This is the same issue as described in clarkie/dynogels#125. If no explicit table name is provided, dynogels uses the first argument converted to lower case as the table name.